H323 Client for MacOS

Good morning,

I am trying to find a good SIP/H323 client for MacOS… is the Polycom RealPresence the only option or is anyone know of a good (cheaper!) solution. This would be very occasional use…

Thank you!

PS: I should add that it should support URI calling… was trying Jitsi but it doesn’t seem to like calling without any server/account configuration. Tried also Meeting but it would seem that the project is too old, didn’t recognize my macbook’s camera and the video from the waiting room either.